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Luminescence signature of free exciton dissociation and liberated electron transfer across the junction of graphene/GaN hybrid structure.

Publication ,  Journal Article
Wang, J; Zheng, C; Ning, J; Zhang, L; Li, W; Ni, Z; Chen, Y; Wang, J; Xu, S
Published in: Scientific reports
January 2015

Large-area graphene grown on Cu foil with chemical vapor deposition was transferred onto intentionally undoped GaN epilayer to form a graphene/GaN Schottky junction. Optical spectroscopic techniques including steady-state and time-resolved photoluminescence (PL) were employed to investigate the electron transfer between graphene and n-type GaN at different temperatures. By comparing the near-band-edge excitonic emissions before and after the graphene covering, some structures in the excitonic PL spectra are found to show interesting changes. In particular, a distinct "dip" structure is found to develop at the center of the free exciton emission peak as the temperature goes up. A mechanism that the first dissociation of some freely moveable excitons at the interface was followed by transfer of liberated electrons over the junction barrier is proposed to interpret the appearance and development of the "dip" structure. The formation and evolution process of this "dip" structure can be well resolved from the measured time-resolved PL spectra. First-principles simulations provide clear evidence of finite electron transfer at the interface between graphene and GaN.

Duke Scholars

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Published In

Scientific reports

DOI

EISSN

2045-2322

ISSN

2045-2322

Publication Date

January 2015

Volume

5

Start / End Page

7687
 

Citation

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Wang, J., Zheng, C., Ning, J., Zhang, L., Li, W., Ni, Z., … Xu, S. (2015). Luminescence signature of free exciton dissociation and liberated electron transfer across the junction of graphene/GaN hybrid structure. Scientific Reports, 5, 7687. https://doi.org/10.1038/srep07687
Wang, Jun, Changcheng Zheng, Jiqiang Ning, Lixia Zhang, Wei Li, Zhenhua Ni, Yan Chen, Jiannong Wang, and Shijie Xu. “Luminescence signature of free exciton dissociation and liberated electron transfer across the junction of graphene/GaN hybrid structure.Scientific Reports 5 (January 2015): 7687. https://doi.org/10.1038/srep07687.
Wang, Jun, et al. “Luminescence signature of free exciton dissociation and liberated electron transfer across the junction of graphene/GaN hybrid structure.Scientific Reports, vol. 5, Jan. 2015, p. 7687. Epmc, doi:10.1038/srep07687.
Wang J, Zheng C, Ning J, Zhang L, Li W, Ni Z, Chen Y, Xu S. Luminescence signature of free exciton dissociation and liberated electron transfer across the junction of graphene/GaN hybrid structure. Scientific reports. 2015 Jan;5:7687.

Published In

Scientific reports

DOI

EISSN

2045-2322

ISSN

2045-2322

Publication Date

January 2015

Volume

5

Start / End Page

7687